I am not possitive, but one would think that his powers would apply to water based reptiles for sure. Strictly land based ones I would think not though, correct me if I am wrong.
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He's not limited to water at all. He's done telepathic battle with Bizarro. Dominates humans. Any creature from Earth can be subdued as all life on it is water-based.
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Hmm. So Wonder Woman is immune to him? Willpower has something to do it with too, I guess...is he still affecting them through physical means (like he did to Zum) or through mental means?
He used to mental powers against some alien on time I can remember. The alien (or whatever the hell it was) had a GL ring and Aquaman grabbed him and used his telepathy to connect to the ring and his willpower to work it. Frickin awesome scene